Porcupine and North Dome trails seem to be (mostly) the same trail, except that access to the rim (to get a view on the valley) is not clearly indicated.
We went off path once close to the rim, but it would be definitely nicer if some (clear) spots were indicated on the maps / by rangers to get access to those awesome views!

Nice, small secluded beach with a view on the bridge. Good spot for pictures at sunset I think. Beware of sun during the day, as the beach is very exposed. Some trees in the back but then you're far from the beach.